Here is the full list of all 19 Doki Doki Literature Club Plus! achievements. It takes around 6-8 hours to unlock all of the achievements on Windows.
Achieve 100% data collection.
Love, Monika
Listen to a lot of what Monika has to say.
Write a poem in 20 seconds or less.
Delete Monika twice while getting deleted zero times.
Spend 20 minutes listening to music on the desktop.
Draw boxes on the desktop.
Review Paula's project plan.
Finish all of the Side Stories.
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Find Dan's special note.
Ruin the game.
Choose not to quit DDLC.
Write a perfect poem for Monika.
Start a New Game.
Write a perfect poem for Natsuki.
Write a perfect poem for Sayori.
Write a perfect poem for Yuri.
Spend enough time during the poem minigame for the music to loop.